Test-Retest Reliability of Postural Control Assessment on Biodex BioSway™

Table 3

Reliability analysis and agreement metrics.

	Reliability/agreement metrics
	ICC (CI)		Sig.	SEM	MDC	Corr	Sig. (Corr)
EO, firm (C1)
SI	0.00 (-0.38-0.38)	1.00(18, 18)	0.500	0.14	0.39	-0.13	0.59
ES	0.03 (-0.35-0.40)	1.06(18, 18)	0.450	1.95	5.42	0.01	0.97
AREA95	0.06 (-0.32-0.43)	1.14(18, 18)	0.400	0.48	1.34	0.04	0.87
EC, firm (C2)
SI	0.47 (0.13-0.71)	3.06(18, 18)	0.010	0.14	0.38	0.52	0.02
ES	0.46 (0.12-0.71)	2.85(18, 18)	0.020	1.85	5.14	0.49	0.03
AREA95	0.41 (0.07-0.67)	2.67(18, 18)	0.020	0.47	1.31	0.56	0.01
EO, foam (C3)
SI	0.16 (-0.23-0.50)	1.37(18, 18)	0.250	0.10	0.28	0.13	0.59
ES	0.46 (0.11-0.71)	2.73(18, 18)	0.020	1.56	4.34	0.48	0.04
AREA95	0.00 (-0.38-0.38)	1.00(18, 18)	0.500	0.62	1.71	-0.02	0.94
EC, foam (C4)
SI	0.62 (0.26-0.82)	5.53(18, 18)	0.000	0.16	0.45	0.75	0.00
ES	0.45 (0.10-0.70)	3.15(18, 18)	0.010	3.46	9.58	0.60	0.01
AREA95	0.81 (0.55-0.92)	12.64(18, 18)	0.000	1.04	2.88	0.87	0.00
HS, EC, firm (C5)
SI	0.58 (0.26-0.79)	3.91(17, 17)	0.000	0.13	0.35	0.59	0.01
ES	0.62 (0.32-0.81)	4.61(17, 17)	0.000	1.54	4.26	0.65	0.00
AREA95	0.69 (0.42-0.85)	5.49(17, 17)	0.000	0.26	0.73	0.70	0.00
HS, EC, foam (C6)
SI	0.59 (0.27-0.79)	4.09(17, 17)	0.000	0.36	1.00	0.64	0.00
ES	0.63 (0.34-0.82)	4.71(17, 17)	0.000	4.53	12.55	0.65	0.00
AREA95	0.59 (0.28-0.80)	3.94(17, 17)	0.000	5.21	14.44	0.66	0.00

EO: eyes open; EC: eyes closed; C: condition; Firm: stable standing surface; Foam: medium density foam standing surface; HS: head shake; SI: Sway Index; ES: Equilibrium Score; AREA₉₅: area of center of gravity 95% confidence ellipse; ICC: intraclass correlation coefficient; CI: confidence interval; Sig: significance; SEM: standard error of the mean; MDC: Minimum Detectable Change.